Combined milling and drilling machine



March 11, 1930. G. MELLING COMBINED MILLING AND DRILLING MACHINE Filed April 29, 192'? 7 Sheets-Sheet N mm 5 3 vi IN VEN TOR Mead/77 60/ e U f M M 'ITORNE V8 March 11, 1930." G. MELLING 1,750,046

COMBINED MILLING AND DRILLING MACHINE Filed April 29. 192'! '7 Sheets-Sheet 2 1N VEA TOR Geo/"7e ['16/[1777 March 11, 1930. G. MELLING 1,750,046

COMBINED MILLING AND DRILLING MACHINE Filed April 29, 1927 '7 Sheets-Sheet 3 l/QVENTOR Y flea/7a Mali/77 A TTORNE Y! March 11, 1930. G. MELLING comanmn MILLING AND DRILLING mcnmn Filed April 29,- l92'7 7 Sheets-Sheet l N V E N ZO R 660/76 Mala/27 March 11, 1930. G. M'ELUNG 1,150,046

COMBINED MILLING AND DRILLING MACHINE Filed April 29, 1927 'TSheets-Sheec 5 11V Vli/VTOR 660/76 Mali/77 A TTU/{NE Vs G. MELLING March II, 1930.

I COMBINED MILLING AND DRILLING MACHINE Filed April 29, 1927 7 Sheets-Sheet 6 IN VEN T 0R flizoz/wq/Wel/MZ A TTORNE VS March 11, 1930.

G. MELLING COMBINED MILLING AND DRILLING MACHINE Filed April 29, 192'? 7 Sheets-Sheet 7 665/76 I C X A 7701mm VS Patented Mar. 11, 1930 i I UNITED STATES PATENT @FFICE GEORGE MELLING, OF JACKSON, MISSISSIPPI COMBINED MILLING AND DRILLING MACHINE Application filed April 29, 1927. Serial No. 187,648.

The main objects of this invention are: Vertical section on a line corresponding to First, to provide a combined milling and line 5 of Figs. 4 and 10. drilling machine adapted to perform several Fig. 6 is an enlarged fragmentary perspecoperations on a piece of work which is autotive view showing details of the operating 5 matic in operation and of large capacity. and driving connections for various parts.

Second, to provide an improved machine Fig. 7 is a fragmentary perspective view of the class described in which various movshowing the reamer and directly associated ing parts are so arranged as to act as counparts. tel-balance parts, thereby relieving the mech- Fig. 8 is a fragmentary perspective view of 3.0 anism of stresses and also reducing vibration. the last milling cutter and the directly as- Third, to provide an improved machine sociated parts. of the class described in which several. oper- Fig. 9 is an enlarged fragmentary perspecations on the same piece of work are accutive view of parts shown in Fig. 7, work rately performed without re-chucking or rebeing shown in one of the work holders and 5 adjusting the work in its holder. the reamer in retracted position after the Fourth to )rovide an im roved rotar' hole has been reamed.

work turret or table with means for autolug. lb 13 a detail section ona line corrematically adjusting and positioning or insponding to the broken line lit-10 of Figs. dexing the same for successive operations. 1 and 5.

Fifth, to provide an improved automatic Fig. 11 is a fragmentary horizontal secwork table feed means. tion on a line corresponding to line ll-11 of Sixth, to provide in a structure of the class Fig. 5. described an automatic control whereby the Fig. 12 is a fragmentary horizontal secmachine is automatically stopped in the event tion on the broken line 12-42 of F ig. 5.

25 of failure in proper adjustment and indeX- Fig. 13 is a fragmentary perspective view ing of the parts. of parts of one of the work holders.

Seventh, to provide an improved work Fig. 1a is a fragmentary plan view of one holder. of the work holders, parts being shown in Objects pertaining to details and econosection. mies of construction and operation of my Fig. 15 is a detail section on a line correimproved machine will definitely appear spending to line 15-15 of Fig. 14. from the detailed description to follow. The F 16 is a fragmentary perspective view invention is clearly defined and pointed out show'ng details of the work table feed and in the claims. indexing mechanism.

35 A structure embodying the features of my Fig. 1? is a side elevation of a clevice or 35 invention is clearly illustrated in the accomcoupling blank for which the machine illuspanying drawing forming a part of this aptrated is especially designed or adapted, a set plication, in which: of milling cutters being illustrated by dotted F ig. 1 is a front perspective view of a struclines in retracted position. ture embodying the features of my invention Fig. a side view of the same parts with the parts of the supporting frame being broa set of milling cutters in their advanced poken away. 'sition.

Fig. 2 is a rear perspective view with the Referring to the drawing, 1 represents the parts of the supporting frame broken away. main bed or supporting frame of the machine,

Fig. 3 is an end perspective view looking this going suitably shaped to provide a supfrom the right of Fig. 1 and the left of Fig. 2. port for t e various parts of the machine.

Fig. 4 is a detail view partially in horizon- On this-:- bed I mount a foot member or stirrup tal section on a line corresponding to line 2 having a. socket 3 for the upright post 4. 5-5 of Figs. 1, 2 and 5. The stirrup 2 has an annular rim 5 which Fig. 5 is a fragn'ientary view partially in serves as a support for the annular way 6, the

turret or table 7 being conformed to bear on the top and outer side of this bearing member 6 as shown in Fig. 5.

The table is provided with a plurality of spaced driving and indexing lugs 8. The means for driving the table with a step by step motion will be described later.

The post 4 carries a crosshead or bracket 9 which is clamped upon the post by means of bolts 10. This post also carries the crosshead or bracket 11 which is clamped to the post by means of the bolts 12. The crosshead 11 has outwardly disposed segmental projecting ways 13 for the oscillating carriages 14 which are pivoted at 15 on the projecting arms 16 of this crosshead 11.

These carriages any the shafts 17 of the cutters 18 and are provided with suitable bearings for these shafts, not detailed herein. The carriages 14 have slide bearings 19 provided with adjustable friction 0r bearing plates 20, these plates being adjusted by means of the screws 21, see Fig. 8.

These carriages carry forked bearing brackets 22, the brackets having a limited or swinging movement on the shafts while the gears 23 on the shafts 17 are arranged between the arms of the brackets. The brackets are provided with bearings for the driving shafts 25 and 26see Figs. 1 and 4.

The driving shafts 25 and 26 are provided with beveled gears 27 which mesh with the beveled gears 23. These shafts 25 and 26 are connected by the universal joints 28 to transmission shafts 29 and 30. This transmission will be described later. It should be pointed out at this time. however. that the connection is such that it permits the oscillation of the carriages on their ways without affecting the driving connections.

It will be noted that these carriages 14 are disposed in an opposed relation on opposite sides of the post 4. They are simultaneously operated by means of the double cam 31 which is oscillatingly mounted on the post 4. The carriages are retracted and held yieldingly against the cam 31 by means of the springs 32 which are mounted on the rods 33 to be engaged by the arms 35 on the carriages. the arms having eyes through which the rods 33 are disposed.

The cam 31 is actuated by a cam 36 acting on the push rod 37, one end of which is connected to the cam and the other end of which is supported by the rocking arm 38 pivoted at 39. The arm 38 is provided with a roller 40 coacting with the cam 36. The push rod is provided with a turn buckle 41.

The cutters are, by this arrangement of parts, simultaneously fed to the work and simultaneously retracted. As stated, they are mounted in opposed relation on the crosshead or bracket 11 on the post 4 so that the stresses are largely counterbalanced.

The crosshead or bracket 9 on the post carries the drill housing 42 and the reamer housing 4:3. These housings are provided with arms at lapping upon the ends of the cross member 11 and securely bolted thereto. The spindles 45 and 4-0 are provided with feed racks 47 with which the feed pinions 48 on the rockshafts 49 coact to advance and retract the drill and rcamer which are conventionally shown at 50 and 51, the chucks being conventionally shown at The drill spindles 45 and 40 are provided with beveled gears 53 and 54-, res 'iectively, at their upper ends. The gear 53 is driven from a shaft 55 having a gear 56 thereon meshing with the gear 53. This shaft is supported by a bea ring :37 on a yoke-like bracket 58 carried by the housing 42. This bracket also carries a bearing 59 for the upper end of the drill spindle The shaft is driven from the transmission. the details of which will be later described.

The gear 54 of the spindle .6 is connected to the gear by means of the shaft 60 mounted in. bearings (31 carried by the post 4; and the beveled gears (32 on the shaft (30 meshing with the gears and 54. The drill spindles are thus driven at the same speed.

The feed racks are also simultaneously actuated, one rockshaft 49 being provided with an arm 63 which is oscillated by the pushi-od (S4 pivoted at one end to the arm (33 and supported at its outer end by the rocker (55 which is pivoted at (it; to be acted upon by the cam 67. This rocker carries a roller 68 traveling on the cam. The cam (37 and the cam 36 are mounted on a cam shaft (30 disposed transversely of the machine. the driving connections for this shaft being lescribed later. i

The arm 63 is connected by a link 70 to an arm 71. on the rockshaft 49 of the second spindle feed pinion. One of the shafts 4:9 provided with an arm 72 to which the spring 73 is connected for retracting the spindles.

I will now describe the driving and indexing means for the table or table or turret 7. This consists of a slide 74 mounted in the slide bearings 75 to reciprocate horizontally at the side of the turret. This slide is actuated from the cam 76 on the cam shaft (59, the cam acting upon the lever 7'? which is pivoted at 78 on the transmis ion housing 79 and connected to the slide by means of the link 80. The lever 7'? has a roller 81 coacting with the cam.

A coiled spring 82 is supported by a rod 83 through a block 8 1 projecting from the slide, the spring thru." ..ig against this block and. also against the front bearing for the slide 75. The slide carries a feed pawl 85 which is pivoted on the slide to coact with the teeth or lugs S on the periphery of the work turret. A leaf spring 86 is mounted sting position. The holding pawl 81' is disengaged by the tappet roller 99 on the slice 7 1, the holding pawl having a pr riectii-ig or n 91 with which the roller courts.

The holding pawl is urged to engagin position by the tension spring 92 which connected at one end to the arm 91 and a" the other end to the slide will be that the cam '56 has a long dwe l and a conr paratively short and abrupt drop, the dwel positively holding the slide in its advanced position and thereby heepi l1f:1

eel sion on the retaining pawl through 1 connection described.

To further urge the hold aging position and to com .ducing tension when the slide 1. 1 provide a second spring 93 supported the rod 911 reciproca ing: through a bin. 95 on the main frame. Viith trio nirts tnus arranged the holding or locking pawl pre vides a very strong; and ,1 mes-us holding the table in its index or adjuster. position.

"he turret is n'ovided with. of work holders properly pof. to the lugs don the turret.

seen o posed in opposed block 96 having; a? to engage the side of tin work 100. At the inner i 7, block 96 a jaw 191 pi'wiite l e 101. The jaw 98 has a notched face 102.

The jaw bloc; 97 carries a uegrnentul jaw 193 rotatable in. the jaw bloti tioningg screw 105 is arranged 3 end oi? the work as shown A adjustable to position the w 191 is secin'ec in its adjuste means of the set screw 10%.

A spring pin 10? is provid V screw 105 in its adjusted position. spending spring: pin is provided screw 106. The etails of these sprii are not shown as they form pa invention.

The oscillating or movable vided with a handle 108. the projecting end of a jaw to clamping pos" ranged to grip the work in V gripping or engaging points of ti and 101 as shown in Fig. 14-, tl viding a three-point gripping action tor the in addition to the positioning of the mioning s new 105.

The worl: holder ill istrated is especially designed for the particular form of work illustrated but is readily adapted for other on of work.

The worl; is held or chucked up in my improved holder so as to effectively support the work while it is subjected to the several operations. the drilling positions the wort: further supported by the anvil or thrust members 206 depending from the bra hot car 3- ing the drill spindle housings, the work being carried over these anvils or thrust members.

1 will now describe the drivin connections h for the driven parts heretofore described.

The driving pulley 207 connected to a suitable source of power by a belt 2( end to the shalt 30 by means of a clutch conventionally ind'cated at 209. his clutch is controlled by the hand lever 110. The shaft 30 is connected to the shaft 55 which drives the drill spindles as described by means of the gears 111 and 112.

The shaft 29 is conne ea 15 of the gee. 113

ed by too 117 to the pull 118 on the worm shaft 1 9. A. clutch 120 is provided for connecting the pulley 118 to this worm shalt 119. The worm shaft 119 irives the worm gear 121 on the can shaft 69. With connection the several parts are r irectly conn act d to lie gear 112 and the ar lid on the shaft 29. The are arranged in a gear-box hou 11g 79. The bhfif t 29 projects from the housing 79 and provided with a pulley 116 on its projecting end. This pulley connectthis drivin, driven in synchronism.

An automatic throw-out means is provided for the clutch 120, this being actuated by the -failure of the turret looking or holding pawl 87. This mechanism in the embodiment illustrated comprises a roclishal t 122 disposed the left hand end Oil the bed 1 and having; an upwardly projecting arm bei s1 connecte to the pawl 87 meaiiis of the lit; 121. 111L113 opposite end the rocle is provided wit 1 an arm Which is connected by the lint: 126 to be. crank lever 127 pivoted at 128 and s1 QPOL clutch releasing: ii'iember 129. The sha 6 provided with a tappet 139 which engra e this clutch releasio member when it in it elevated position as shown by dotted lines Fin 2, the clutch re easing member being shilted to its =levated or actuated posit-ion when the holding pawl is in its retracted tured to the gear 112 by arm 128 thereon, the

ret releasing position, so that in the event of gagged, thereby stopping the cam shaft and i consequently the parts actuated thereby.

A menta ly controlled means is provided for releasin,. this clutch consisting of the rocksha'lt 131 which is provided with a hand lever 132 and with an arm 133 connected by the link 134 to the clutch lever 135 to which the releasing member 129 is connected at 136.

I will now point out the operation of the machine described:

The operator standing at the front of the machine places the work in the holders as they are successively brought to position and, after one cycle of the turret has been completed, removes the finished work and places the new work in the holders from which the finished work has been removed. To open the work holders in the embodiment illustrated it is only necessary to swing the aw handle 108 to open the jaw, the spring 109 closing the same when the handle is released.

The work, which is illustrated in Fig. 17 as a forging in the rough, is first operated upon by the first milling cutter 18 which is a multiple cutter consisting of a series of three cutters adapted to face off the sides of the clevice as shown in Fig. 18. The holder jaw 101 is slotted on its inner side to receive the cutters.

From this position the work is advanced to the drill 50 and is supported by one of the anvils 106 during the drilling operations. The drill is constantly driven but its feeding is automatically timed through the cam shaft as I have described.

From this drilling position the work ad vanced to the second or finishing cutters which remove the burr formed by the drill and finish the faces of the work. The work is then advanced to the reaming position, the reamer 57 reaming and finishing the hole.

As I have pointed out, the parts are so arranged that the cutters are simultaneously advanced to and retracted from the work, these parts being oppositely disposed and balanced so that the strain and vibration are minimized. The drilling units are also arranged in opposed balanced relation.

The structure illustrated and described is of very large *apacity and performs its work in a highly cliicient manner. I have not attempted to illustrate or describe various lllOt ifications and adaptations of my improvements to other kinds of work as I believe the disclosure made will enable those skilled in the art to which my invention relates to embody or adapt the same as may be desired.

Having thus described my invention, what I claim as new and desire to secure by Let ters Patent, is:

1. The con'ibination of a rotatable work table provided with a plurality of work hold ers, means for actuating said work table with a step by step movement, a post disposed centrally relative to said work table, a. crosshead mounted on said post and provided with oppositely disposed segmental ways, tool carriages oscillatingly mounted on said cross head in opposed relation and provided with slide bearings coacting with said ways, a

double lobed cam mounted on said post to coact with said carriages whereby they are simultaneously actuated, springs acting to retract said carriages, cutter shafts disposed vertically on said carriages and provided with cutters at their lower ends and with flywheels at their upper ends, forked bearing brackets mounted between said carriages and flywheels, beveled gears arranged on said cutter shafts between the forks of said bearing brackets, driving shafts supported by said bearing brackets and provided with beveled gears coacting with said gears on said cutter shafts, a second crosshead mounted on said post above said cutter supporting crosshead, drill units mounted in opposed relation on said second crosshead and provided with spindles having beveled gears at their upper ends, a shaft disposed centrally above said post and provid d with gears coacting with both of the gears on said spindles, a driving shaft provided with a gear meshing with the gear of one of said spindles, and feed means for said spindles syncln'onized with d tool carriage actuating cam.

ii. The combination of a rotatable work table provided with a plurality of work holders, means for actuating said work table with a step by step movement, a post disposed centrally relative to said work table, a crossliead mounted on said post and provided with oppositeiy disposed s-ginental ways, tool carriagcs osciilatingly mounted on said crosshead in opposed relation and provided with slide bearings coacting with said ways, a

cutter shafts between the forks oi: said bearing brackets, driving shafts sup vorted by said bearing brackets and provided with beveled gears coacting with said gears on said cutter sh a 'ts, a. second crosshead mounted on said post above said cutter supporting crosshead, drill units mounted in opposed relation on said second crossliead, and feed n'ieans for said spindles synchronized with said tool carriage actuating cam.

3. The combination of a rotatable work table provided with a plurality of work holders, means for actuating said work table with a step by step moven'ient, a post disposed cei'itrally relative to said work table, a crosshead mounted on said post and provided with oppositely disposed segmei'ital ways, tool carriages oscillatingly mounted on said crosshead in opposed relation and provided with slide bearings coacting with said. ways, a double lobed cam mounted on said post to co-act with said carriages whereby they are simultaneously a tuated, springs acting to retract said carriages, cutter shafts disposed vertically on said carriages and provided with cutters, driving means for said shafts, beveled years a rrai on said cutter shafts between the forks o id beari brackets, drivir sh fts supported by said bearing l provided with beveled gears co- "l gears on said cutter shafts, tthead mountei'l on said post above said cutter supporting crosshead, drill units mounted in opposed relation on said second crosshea-rjl and provided with spindles having; beveled gears at their upper ends, a shaft disposed. centrally above said post and provided with g; are coactin with both of the gears on said spindles, a driving, shaft provided with a 'ear meshing with the gear of one of said spindles, and feed means for said spindles synchronized with said tool carriage actuating cam.

a. "he combination of a rotatable work table provided. With a plurality of work holders, means for actuating said work table with a by sten movement, a post disposed centrally relative to said work table, a crosshead mounted on said post and provided with oppositely disposed segmental ways. tool carriages oscillatingly mounted on said crr head in opposed relation. and provided with slide bearings coacting with said ways, a double lobed cam mounted on said post to react with said carriages wha-areby they are simultaneously actuated, sprin 's acting to retract said carriages, cutter shafts disposed vertically on said carriages and provided with cutters, driving means for said shafts, beveled gears arranged on said cutter shafts between the forks of said bearing brackets, driving; shafts supported by said bearing brackets and provided with beveled gears coacting with said gears on said cutter shafts, a second crosshead mounted on said post above said cutter supporting crosshead, drill units mounted in opposed relation. on said second crosshead, and feed means for said spindles synchronized with said tool carriage actuatin cam.

o, The combination of a rotatable work table provided with a plurality of work holders, means for actuating said work table with a step by step movement, a post disposed c ntrally relative to said work table, a crosshoad mounted on said post and provided with oppositely disposed segmental ways, tool carriages osoillatingly mounted on said crosshead in opposed relation and provid d with slide bearings coacting with said ways, a double lobed cam coacting with said carriages whereby they are simultaneously actuated, springs acting); to retract said carriages, cutter shafts disposed vertically on said carriages and provided with cutters at their lower ends and with flywheels at their upper ends, forked bearing brackets mounted between said carriages and flywheels, beveled arranged on said cutter shafts between the forks of said bearing brackets, and driving shafts supported by said bearing brackets and provit d w i beveled ears coacting with said gears said cutters.

6. The combination of a rotatable work table provided with a plurality of work hold ers, means for actuating said work table with a step by step mowunent, a post disposed centrally relative to said work table, a crosshead mounted on said post and provided with oppositely disposed. segmental ways, tool carriages oscillatingly mounted on said crosshead in opposed relation and provided. With slide bearings coaeting with said ways, a double lobed cam coacting with said carriages whereby they are simultaneously actuated, springs acting to retract said carriages, and cutter shafts disposed vertically on said carriages and provided with cutters.

7. The combination of a rotatable work table provided with a plurality of work holders, means for actuating said work table with a step by step movement, a post disposed centrally relative to said work table, a cross head mounted on said post and provided with oppositely disposed segmental ways, tool carriages oscillatingly mounted on said crosshead in opposed relation and provided with slide bearing s coacting with said ways, and a double lobetlcam coacting with said car riages whereby they are simultaneously actuated.

8. The combination of a rotatable work table provided with a plurality of work holders, means for actuating said work table with step by step movement, a. post disposed centrally relative to said work table, a crosshead mounted on said post, drill units mounted in opposed relation to said crosshead and provided with spindles having beveled gears at their upper ends, a transmission shaft disposed centrally between said spindles and provided with gears coactiup with the gears of said spindles, a driving shaft provided with a gear meshing with the gear of one of said spindles, and feed means for said spindles synchronized with said table actuating means.

9 In a machine of the class described, the combination of a rotatable work table provided with a. plurality of work holders, 1 cans for actuating said work table with a step by step movement, tool carriages oscillatino ly mounted above said table in opposed ation, a cam coacting with said carriages ercby they are simultaneously actuated, ter shafts disposed vertically on said car ri'ages and provided with cutters at their lower ends and with flywheels at their upper ends, forked bearing brackets mounted between said carriages and flywheels, beveled nears arranged on said cutter shafts between the forks of said bearing brackets, driving shafts supported by said bearing brackets and provided with beveled gears coacting with said gears on said cutter shafts, drill units mounted in opposed relation above said table and provided with drill spindles having beveled gears at their upper ends, a transmission shaft provided with gears coacting with both of the gears on said spindles, a driving shaft provided with a gear meshing with the gear of one of the said spindles, and feed means for said spindles synchronized with said carriage actuating cam.

10. In a machine of the class described, the combination of a rotatable work table provided with a plurality of work holders, means for actuating said work table with a step by step movement, tool carriages oscillatingly mounted above said table in opposed relation, a cam coacting with said carriages whereby they are simultaneously actuated, cutter shafts disposed vertically on said carriages and provided with cutters, drill units mounted in opposed relation above said table and provided with drill spindles, and feed means for said spindles synchronized with said carriage actuating cam.

11. The combination of :1V rotatal'ile work table provided with a plurality of work holders. means for actuating said work table with a step by step movement, tool carriages oseillatingly mounted above said work table in opposed relation, means for simultaneously actuating said carriages in opposite directions. cutter shafts mounted on said carriages and provided with cutters, n tans for driving said cutter shafts. drill units mounted in op posed relation above said table and in intermediate relation relative to said tool carriages and provided with spindles having feed racks, beveled gears on the upper ends of said spindles. a transmission shaft provided with gears coacting with the gears of said spindles. a driving shaft provided with a gear meshing with the gear of one of said spindles, rockshafts provided with pinions coacting with said spindle feed racks and with arms, a link connecting said arms whereby the racks are simultaneously advanced and retracted, an actuating cam operatively associated with one of the rocksha'i t arms. and an actuating cam for said tool carriages operatively associated with said spindle feed cam and work table feed means whereby the actuation of the work table and tool carriages and the feeding of the spindles are synchronized.

12. The combination of a. rotatable work table provided with a plurality of work holders, means for actuating said working table with a step by step movement, tool carriages oscillatingly mounted above said work table in opposed relation, means for simultaneously actuating said carriages in opposite directions, cutter shafts mounted on said carriages and provided with cutters, means for driving said cutter shafts, drill units mounted in opposed relation above said table and in intermediate relation relative to said tool carriages and provided with spindles having feed racks, rorkshal'ts provided with pinion-s coacting with said spindle teed racks and with arms, a link connecting said arms wherelry the racks are sinniltaneously advanced and retracted, an actuating cam operatively associated with one of the rockshatt arms, and an actuating cam for said tool carriages operativcly associated with said spindle feed cam and work table feed means whereby the actuation of the work table and tool carriages and the feeding of the spindles are synchronized.

13. In a machine of the class described, the con'ibination ot' a rotatable work table provided with a plurality 01 work holders. means for actuating said work table with a step by step movement, tool carriages oscillatingly mounted above said table in opposed relation, a cam coacting with said carriages whereby they are simultaneously actuated, cutter shafts on said carriages provided with cutters and with flywheels, means for driving said shafts, drill units mounted in opposed relation above said table, and teed means for said spindles synchronized with said carriage actuating cam and table actuating means.

i i. The combination of? a rotatable work table provided with a plurality oi work hollcrs, means for actuating said work table with a step by step movement, tool carriages oscillatingly mounted above said work table in opposed relation, means for SillllllttlllOOU"l),' actuating said carriages in opposite directions, cutter shalts mounted on said carriages and provided with cutters and with flywheels, means for driving said cutter shafts, drill. units mounted in opposed relation above said table and in intermediate relation relative to said tool carriages and provided with spindles, beveledv gears on the upper ends of said spindles, a transmission shail't provided with guns eoacting with the gears of said spindles, a driving shaft provided with a gear mes-:hing with the gcar ol one of sai s 'iindlcs, teed in sans for said spindles, and a actuating means for said carriages operativel associated with said table actuating means and spindle feed means whereby the actuation oi the work table and carriages and the feeding of the spindles are synclu'onized.

15. The combination of a rotatable work table provided with a. plt'lralit'y oi work holders. means for actuating said work table with a st p by step movement, tool carriz 'g'es latin 'ly mounted above said work table 1.; opposed relation, iii-cans for simultaneoiisl actuating; said Clll l s in opposite directio cutter shafts mounted on said or I and prz'irided with cutters and with flywheels, nun 1 tor driving said cutter sha' st drill units mounted in opposed relation above said riae eu 1 table provided with a dies, and an ac ruqa'cs op actuatin means and whereby tie actuation carria;,cs and, the 'i ecdi synchronized.

16. The cmnhinalion o l" a rotatable work plurality of work holdcrs. moans tor actuating said work table with a step by step movement, tool carriages oscillating ly mount d elbO'VL work table in opposed relation, means for simultaneously actuating said carriages in opposite directions, cutter shafts mounted on said car-r111 ant. provided with cu iters and with flywheels, means for driving said cutter shafts, and an actuating means for said carriages operative ly associated with said table actuating: n'ieans and spindle feed means vhereby the ac ation of the work table and carriages and the ing of the spindles are synchronized.

17. In a niachii'ie of the clues dcscri the combination of a work aole prov' 0. means able and on: spindles are l with index lugs, an actuating slide, cam shaft provided with an actuating cam tor said slide, a returl spring for St 1d slide, a driv 1 pawl mounted on said slide to coac; with said index lugs, a pivotally mounted holding; pawl coacting with said index huts and p. itled with a tappet arm, a tappet on sari slide coacting with said tappet arm on said holding pawl whereby the holding pawl is disc" gagged on the return stroke of the slide, an

actuating spring for said holeing pawl connected to said slide, an auxiliary spring urging said holding pawl to engaging position,

driving means for said cam shatt including a clutch, a tappet on said cain shaft, pivot ally mounted clutch releasing: member adapted to swing into the path of said tappet on said. can shaft, a be l or; nk lever adapted to support the swinging end of said releasing member, rockshaitt provided with a pair of arms, a link connecting one of said arms to said tappet arin on said holdii'lg pm i, and link connecting the other arm of d rockwhereby sail shaft to said bell crank lever releasing member is swung into the path o said tappet on said cam shait wh the holding pawl is in disengaged position.

18. In a machine of the class described, the coinhinaton of a work table provided with index lugs, an actuating slide, a cam shaft provided with an actuating; cam for said slide, a return spring for said slide, a iw ing pawl mounted on said slide to coact with an actuating spring for said holding pawl connected to said slide, an auxiliary spring urging said holding pawl to engaging position, driving; means for said cam shaft including a clutch, a tappet on said cam shaft, a. pivotally mounted clutch releasing, member adapted. to swing into the path of said tappet on said cam sl aft, a bell crank lever adapted to support the swinging end of said releasing member, and operating connections tor said holding pawl to said bell crank lever.

19. In a machine of the :lass described, the combination of a work table provided with index lugs, an actuating slide, .a cam shaft provided with an actuating; cam for said slide, a. return spring for said slide, a driving pawl mounted on said slide to coact with said index lugs, a pivotilly mounted holding pawl coacting,- with said indc; lugs and provided with a tappet arm, a tappct on said slide coacting with said tappet arm on said holding pawl whereby the holding pawl is diiengagod on the return stroke of the slide, a rtuating: spring tor said holding pawl connected to said slide, auxiliary spring urging said holding pawl to engaging position, driving means tor said cain shaft including a clutch, and operating connections for said holding pawl to said clutch.

20, in a machine oi? the class described,

the combination of a work table, an indexing awl carrier provided with a driving pawl (TORCH with said work table, a holding )awl, a-tilppet on said carrier acting to re" lease said holding pawl on the return stroke of the pawl carrier, an actuating cam for said pawl carrier, at driving clutch for said artuati cam, a tappet operativey ated said cam, a clutch releasing l118n1- ber adjustably supported relative to said tappet, and a COlltlTl member for said releasing men'iber operatively connected to said holding pawl whereby the clutch releasing member is shifted into operative relationto the tappet when the holding pawl is disengaged,

21. In a machine ot the class described the combination of a work table, an ind nine pawl carrier provided with a driving pawl coacting with said work table, a holding: pawl, a tappet on said carrier acting to release said holding pawl on the return stroke of the pawl carrier, an actuating cam for said pawl carrier, a driving clutch for said actuating ca 11, and operating connections for said holding pawl to said clutch whereby the clutch is automatically disengaged on the failure of the holding pawl to operatlvoly engage the table.

22. In a machine of the class described, the

combination oi. work table, a work holder comp n g a pair of spaced ad ustable with a camming action. and a screw positioning member disposed to coact with the end of the work engaged by said jaws.

23. In a machine of the class described, the combination of a work table, a work holder comprising a pair of spaced jaws adapted to engage the side of the work, a coacting jaw disposed in opposed relation to said pairs of jaws and adapted to engage the work between said pairs of jaws with a can'uning action. and a screw positioning member disposed to coact with the end of the work engaged by said jaws.

24. In a machine of the class described, the combination of a work table, a work holder comprising a pair of spaced adjustable jaws adapted to engage the side of the work, and a coacting rotatably mounted segmental jaw disposed in opposed relation to said pairs of jaws and adapted to engage the work between said pairs of jaws with a camming action.

25. In a machine of the class described, the combination of a rotatable work table pro vided with a plurality of work holders, means for actuating said work table with a step by step movement, tool carriages pivotally mounted above said work table with their pivots in opposed relation relative to the axis of the table, ways for the swinging ends of? said tool carriages, cutter shafts provided with cutters mounted on said tool carriages in opposed relation relative to the axis of the table, a double lobed cam having its axis eoincident with that of said table coacting with said carriages whereby they are simultaneously actuated, drill units mounted in opposed relation relative to the axis of the table, and feed means for said spindles synchronized with said carriage actuating mechanism and table actuating means.

26. In a machine of the class described, the combination of a rotatable work table provided with a plurality of work holders, means for actuating said work table with a. step by step moven'ient, tool carriages pivotally mounted above said work table with their pivots in opposed relation relative to the axis of the table, ways for the swinging ends of said tool carriages, cutter shafts provided with cutters mounted on said tool car-11 s in opposed relation relative to theaXis of the table, and a double lobed cam havm its art's coincident with that of said table enacting with said carriages whereby they are s multaneously actuated.

in opposed relation relative to toe axis of the table, means for simultaneously oscillating said carriages, drill units mounted in opposed relation relative to the axis of the table, and feed means for said spindles synchronized with said 'carr' actuating mechanism and table actuating means.

28. In a machine of the class described, the combination of a rotatable work table provided with. a plurality of work holders, means for actuating said work table with a step by step movement, tool carriages pivotally mounted above said work table vith their pivots in opposed relation relative to the axis of the table, ways for the swinging ends of said tool carriages, cutter shafts provided with cutters mounted on said tool carriages in opposed relation relative to the axis of the table, and means for simultaneously oscillating said. carriages.

29. In a machine of the class described, the combination of a rotatable work table provided with a plurality of work holders, means for actuating said work table with a step by step movement, tool carriages oscillatingly mounted above said work table in opposed relation relative to the axis of the table, cutter shafts provided with cutters mounted on said tool carriages in opposed relation relative to the axis of the table, a double lobed cam having its axis coincident with that of said table coacting with said carriages whereby they are simultaneously actuated, drill units mounted in opposed relation relative to the axis of the table, and feed means for said spindles synchronized with said carriage actuating mechanism and table actuat mg means.

30. In a machine of the class described, the combination of a rotatable work table provided with a plurality of work holders, means for actuating said work table with a step by step movement, tool carriages oscillatingly mounted above said work table in opposed relation relative to the axis of the table, cutter shafts provided with cutters mounted on said tool carriages in opposed relation relative to the axis of the table, and a double lobed cam having its axis coincident with that of said table coacting with said carriages whereby they are simultaneously actuated.

31. In a machine of the class described, the combination with a work table, an indexing pawl carrier provided with a driving pawl coacting with said work table, a holding pawl, a tappet on said carrier acting to release aid holding pawl on the return stroke of the pawl. carrier, an actuating means for said pawl carrier, a driving clutch for said actuating means, and operating" connections for d holding pawl to said clutch whereby the clutch is automatically disengaged on the failure of the holding pawl to operatively engage the table.

32. In a machine of the class described, the combination with a Work table, an indexing pawl coacting with said work table, a holding pawl, means acting to release said holding pawl on the return stroke of the indexing pawl, an actuating means for said indexing pawl, a driving clutch for said actuating means, and operating connections for said holding pawl to said clutch whereby the clutch is automatically disengaged on the failure of the holding pawl to operatively engage the table.

In witness whereof I have hereunto set my hand.

GEORGE MELLING.

CERTIFICATE OF CORRECTION.

Patent No. 1,750, 046. Granted March ll, 1930, to

GEORGE MELLING.

It is hereby certified that error appears in the above numbered patent requiring correction as follows: In the grant and in the heading to the printed specification the residence of the patentee was erroneously written and printed as "Jackson, Mississippi", Whereas said residence should have been written and printed as "Jackson, Michigan"; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 22nd day of April, A. D. 1930.

M. J. Moore, (Seal) Acting fiommissioner of Patents. 

